Programming, witting, web development, graphics, art, games andd science. Anything that requires inputting large amounts of data.
Maybe you need to re read my post. Then you need think about how a touch screen works as good as a mouse...and how a keyboard displayed on a touchscreen is as good as a keyboard for 90% of things.
For everything that a laptop is good enough for, a very large i-phone like computer would also be good enough for.